Thread controller



G. S. GATCHELL. THREAD CONTROLLER.

, APPLlCATION FILED JAN. 2. i919. 1,432,683.

mmm 0615.111922,

2 SHEETS-SHEET 2.

WITNESSES:

lNvENToR CWM' m Y WL im BW I A TORNEY Patented ct. l?, 1922.

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ena'ens. ee'roirniiii, "or geen, 'ijiiitsiivpnssrefion yfre SINGER MANUFACTURING COMPANY, A Conron'nrron or NNW anis-sev.

Trainerin comedians.

Application inea zianuari; 2.71219. serial No. 269,225.

To @ZZ whom't may concern:

Be it knovvn that I, GEORGN-S-Gnronnnn, a citizen of the llnited States, residing at Roselle Park, in the `.county of Unionand State of New Jersey, .have` inventedcertain neiv and useful` Improvements in l'lhread Controllers, of ,which thefollowing isa specication, referenceheing had therein to the accompanying drawings.

Thisfinvention relatesA to a threadcon troller forvsewing.machinesv i 4lt has for its object to provide an irnproved form of oscillatory thread-cont-rfoller which vvill have allthe advantagesof therotary form, and in addition Willfavoid the Winding of the thread around the take-up Which is a common defect. inthe 4rotary forms. lt also aims to secure, greater compactness, thereby pe'rniitting..thefdisposition of the take-up in the Work-arm of a cylinder hed machine Without undue crowding or enlargement of the latter.

In its preferred-form the. improvement is embodied in a machine having an overhanging arm 'carrying a plurality of needles,V and a cylinder-hed havingV mounted therein a common form of eyed looper and a feed mechanism, all of the moving parts being driven from a' transversely'disposed mainsh'aft, as inpatent to MolyneumNo. 1,127,- 069, dated February 2, 1915. |The take-up comprises a shaft meunted transversely in the cylinder-hed of the machine, said shaft being oscillated by an arm thereon connected to an leccentric on the main-shaft; Secured to the sha-ft by set-screws are atake-up arm and a pull-off arm; a thread-nipper losing` disposed `loetive'en them. The take-up andl pullsoi'f arms each have a slotted or. bifurcated end through Wlii'clrpasses a cast off arm. Pairs of thread guides are. mounted on opposite sides of the take-.up and .pulloff arms to dispose the thread inthe path of said parts. The take-upy armis formed at its end With opposed, curved, thread-engaging surfaces, one of which v,is relatively er;-v

tended and terminates' in a hump or projection on the sli'de ofthe arm.fvvhilethe other surface merges'vvith the first one at the top of the arm aud 'etends'inra shortsharp curve merging Withffthe `opposite sideY of the arm. The cast-on' armforthe take-up has a concavedupper surface extending suhsta'ntially. .hbrizontally at one end .v to coact with the hump or projection, While theother end curves sharply upward to form a projection coating Vwith thesharply curved surface ony the `take-up. lThe pull-olf arm has symmetrically opposed curved thread-engagingfsurfaces which merge at its end and also lmergewith the sides ofthe arm. The cast-off' armfor the pull-ofi1 has a concaved upper surface, one end of Which coacts with oneof the thread-engaging surfaces of the pull-off, and the other end of Which concavedsurface has` a L.slight projection coacting with the other thread-engaging surface ofthe pull-off. The pairs of thread-guides have pivotally mounted supports and are yieldingly. held in either operative `or inoperative position, and each support carries al respective cast-off arm. Means are provided for adjusting theoperative position of the thread-guides and cast-off arms relatively to their respect-ive take-up and pulloif arms, which adjustment will vary the amount of threadA handled.

In the drawings', Fig. l is a side elevation of ay sewing machine embodying my improved formV of thread-controller, parts hehroken away and omitted to more clearly disclose `the `vcontroller and its operating mechanism. Fig. 2 is a top plan view ofthe controller, on an enlarged scale. Fig. 8 is a section through the Work-arm or cylinderhed, looking toward the controller. Fig. .4 is a section on the line t-h Fig.,2lout with the take-up and `pull-off arms in the opposite position to that shown in Fig. 2. Fig. 5 is a section on the line 5 5, Fig. 2, but with the parts also in the position opposite to that shown in Fig. 2. i i i .Referring to the drawings, l indicates the standard of the machine, 2 the overhanging arm, 3 the needle-har and l the needles. A cylinder-hed or Work-arm 5 extends from the standard l, in which are mounted a tlireadrcarrying looper 6 and a feed-dog (not shown). Theplooper may he of any preferred forim such as shown in patent to li'iolyneux,.l\lo. 1,127,795, vFebruary 9, 1915, orl in my copending application Serial No. 185,446, filed August l0, 1917. The looper is rocked hy the shaft 7 and sid'ewise move ment is communicated. to it by a shaft 8:, said shafts, the feed-dog and needle-har all being actuated from the main-shaft 9 in a manner Well known in the art. A rocleshaft 10 is mounted transversely in the lWork-arm 5 hy pivot screws '1.1. and a ro'clarm l2 extends downwardly from one end ol said shaft. To the lower end of the arm 12 is pivotally connected an arm 13 carried by an eccentric strap 14 surrounding an eccentric 15 mounted on the main-shaft 9. Secured to shaft 10 by a set-screw 16 is a take-up arm 17. The arm 17 is slotted as shown at 18 (Fig. 3) to provide for a cast-off member to be herein-- after described. The top of the arm is provided with opposed cam surfaces which merge to form a continuous curve. The forwardly directed convex cam surface edge 19 (Fig. 5) extends inwardly or toward-the center of the shaft 10 in a long, gradual curve up to the projection 20 at thefront edge of the arm 17, which front edge is concaved inwardly of the projection 20. The rearwardly directed cam-edge 21 is relatively short and curved sharply downward from the point where it meets the surface 19 until it merges in the convex rear edge of the arm. Projecting' upwardly from the inner bottom wall of the work-arm is a lug 22, and a bracket 23 is `secured to said lugby a screw 24 passing through a slot 25 in the bracket and threaded into the lug. A block 26 is secured to the rear side of the bracket 23 by a screw 27, and aplate 28 (Figs. 2 and 5) is pivoted at its rear end to the block by a pivot pin 29. Extending forwardly from the plate 28 at each side of the take-up arm 17 are guide-arms 30 and 31 provided with thread-eyes 32. TheV plate 28 has a beveled portion 33 at its rear end (Fig. 5) in engagement with a flat spring 34. 1t will be notedl that when the guidearms are in lowered position-the beveled portion 33 engages the spring 34 at one side of a bend 35 therein, while when the guide-arms are raised the portieri 33 engages the spring on the other side of the bend, the guide-arms being thus yieldingly held in either position. The shank 36 of a cast-off` arm 37 is secured to the plate 28 by a screw 38. The arm 37 has acast-off portion 39 which is sharply inclined upwardly and is located in rear of the thread-eyes 32, which portion acts to cast off the thread from the rear cam surface 21 of the take-up arm as the latter moves rearwardly. The front portion 40 of the cast-off arm extends substantially hori` Zontally but its upper surface curves slightly upward in a forward direction, and this portion acts to cast off the thread from the projection 20, as the take-up arm moves forwardly. An adjusting screw 41 (Fig. 2) is threaded through plate 28 and is adapted to engage the upper surface of the block 26 to vary the positions of the guide-arms and cast off arm relatively to the take-up arm.

Also mounted on the rock-shaft 10is a pull-pif arm 42 which is secured thereon by a set-screw 43. This arm is slotted at 44 to provide for a cast-off member to be hereinafter described, 'The top ,of the arm is pro-.

vided with opposite cam` surfaces 45 of similar curvature which merge at their upper ends to form a continuous curve, while their lower ends merge into the side walls of the arm. y.

A second plate 46 is mounted on the block 26 alongside the plate 28 (Figs. 2 and 4) and is pivoted to the block at its rear end by the pin 29. Guide-arms 47 and 48 extend forwardly from the plate 46 on each side of the pull-oft' arm and are provided with thread-eyes 49 in alinement with the eyes 32. The plate 46'has a beveled portion 50 at its rear end in engagement with a flat spring 51 having a `bent portion 52, by which the plate 46 and .its guide-arms may be yieldingly held in raised or lowered position in a manner. similar to the plate 28 and guidearms 30 and 31. The shank 53 of a cast-off arm 54 is secured to the plate 46 by a screw 55, said arm having a concaved upper surface 54 adapted to engage with 'either side of the pull-off arm as the latter is -oscillated, this concaved surface being slightly raised at its rear end to form a projection 54 which aids in casting 0E the thread. An adjusting screw 56 is threaded through the plate 46 and is adapted to engage the upper surface of the blockl 26 to vary the positon of the guide-arms 47 and 48 and the cast-off .arm 54 relatively to the pull-off arm. Y

An arm 57 extends forwardly from the upper end of bracket 23 (Fig. 4) and has a vertical extension 58 located between the take-up1 and pull-olf arms, said extension forming one member of a thread-nipper. The other member of thenipper is Vconstituted by a flat spring 59 secured by a screw 60 to the front portion of the bracket 23,the upper end ,of the spring normally pressing against theiextension 58 to nip the thread. A. four cornered cam member 61 having slightly convexed sides is securedv on the shaft 10 between lthe take-up and pull-oli'l arms and is adjustably held by a set-screw 62, said cam member when the take-up is in its eXtreme rearward positon as shown in Fig. 4 having one of its corners 61 bearing against the spring59 to thereby open the nipper.` It is evident from Fig. 4 that when the take-up isin extreme advancedposition another corner will bear against Athe spring 59, again opening the nipper. In intermediate positions of the take-up and pull-off the nipper is closed. The looperthread 63 leads from the supply through a tension 64 on the overhanging arm, then through the guidefaperture 65 in the workarm,through theeyes 49 in the uide-arms 48 and 47 between the nipper e ements 58 and 59, through `the guide-eyes 32 in the guide-arms 31 and 30, tothe forward part of the work-arm and to the heel of the ,loopen up to throw outtheir loopsthe Elooper begirls tojlafdvance, 'thfenip'perv closes, and the take-tip and pull-off start rearwardly. vOnly afsmaill take-tip of'threadiis necessary fat this time, ydue to the slack fr'medjin front ofthe looper-eye, and the sharply inclined portion 39 quickly casts off the thread 'from the convexly urved 'cam fsurfac'eI 21 of the take-up, thereby "effecting the `desired result As the looper ladvances well 'into th'e thethreiad doubled 'along it *and-'a "reliatively `large supply of thread is necessary. This is v'furnished the thre'adslipping over the convex cam "surface T9 'and 'also by "the opening of t'henipp'er as the vparts reach the position shown in Figs. land When this position is reached the needles are all the way up, .the looper fully advanced, the take-up and pull-oil' in their rearmost position, and the nipper opened. As the needles start down again, the looper is retracted, the nipper closes, and the takeup and pull-olf start forwardly. It is evident that on account of the doubling of the thread along` the looper a large take-up is necessary during the first part of the looper retracting movement, and this is effected by the concaved cam-edge immediately under the projection 20, as owing to the substantially horizontal disposition of the cast-off portion 4L() said portion does not cast the thread over the projection 20 until the arm 17 has swung forward a considerable distance. As the looper continues in its backward movement it is necessary to supply slack thread to a limited extent. This is furnished by the thread slipping over the cam surface 19 and down the surface 21, thread also being drawn through the nipper as the latter opens when the take-up and pull-off reach their forward position. r

Having thus set forth the nature of the invention, what I claim herein is- 1. In a sewing machine, a thread-carrying implement, an oscillatory cam take-up therefor having alternately acting concave and convex cam-edge portions, means for oscillating said take-up thread-guiding means, and relatively stationary cast-ofi` means constructed and arranged to coact with -said cam-edge portions and thread-guiding means to cause a differential thread control upon movement of the take-up in different directions as it is oscillated.

2. In a sewing machine, thread-carrying means, thread-guides, an oscillatory take-up member moving between said guides and having opposed convex and concave cam needief-'loops last arm 'for causing'ia relatively quick castofl' :the thread in "one o'f 'the oscillatory movements 'of saidrst arm, and rsaid arm adaptedtofcause a delayed 'cast-dif of the thread on movement ofthelirSt arm lin the o,jfbppesiite direction. y

il. :Tn a 'sewing' machine, "a thread-carrying looper,` guide-arms.; having thread-eyes,` a shaft, nearis fo`r osc`*`il"lfating the same, 'a takeupfhiembersecured to said shaft between `"guide'-arms, lan extended curved 1cam surface fait. one side of r'safid Etake-up member and terminating in a projection, a relatively short curved cam surface at the other side of said take-up member, and cast-off means having a horizontal portiony in front of said thread-eyes for coaction with said projection and a sharply `inclined upwardly directed `portion in rear of said thread-eyes for coaction with said second cam surface.

5. In a sewing machine, a pivotally mounted support carrying a pair of eyed threadguides, an oscillatory shaft extending transversely of and below said guides, a slotted arm secured to said shaft and movable between said guides, forwardly and rearwardly extending curved take-up surfaces at the top of said arm, said forwardly extending surface terminating in a projection, a cast-ofi' member extending through the slot in said arm and having a forwardly directed portion coacting with said projection and an upwardly directed portion coacting with the rearwardly extending curved surface, and a thread-nipper and pull-ofi1 coacting with said take-up.

6. In a sewing machine, an overhanging arm and a work-arm, a needle and an eyed looper carried by said respective arms, a shaft extending transversely of said workarm, means for oscillating said shaft, opposed thread-guides, a take-up arm carried by said shaft and having convex and concave opposed cam edges adapted on oscillation of the shaft to engage opposite sides of the thread extending between said guides, and relatively stationary cast-off means for the thread.

7. A thread-controller comprising an oscillatory shaft having an arm secured thereto, means for supporting a thread in the path of said arm, said arm having a concave cam-edge and lateral thread-engaging projection on one side thereof and an outwardly extending curved thread-engaging surface extending from said projectionacross lthe tree end of saidarm and merging with its opposite side, and cast-off means disposed on opposite sides of said arm and coacting therewith to cause a differential thread control on-.oscillationfofsaid shaft.

8.4 thread-controller comprising.an4 oscillatory shaft having slotted take-up and` pulhoffarins thereon, means for guiding a thread in thepath of said arms, opposed cam surfaces on eachfof saidA arms torengaging' the thread, one "of the surfaces on the take-'up arm being extended to fornia thread-engaging projection, lcast-off means extending through the slot-s in said arms and coacting With said surfaces, `and anipper located between` said take-up and Apull-olf arms. s

9. In a thread-controller, means `for guiding'lthc thread, an oscillatoryv shaft, a take.- up .carried by said shaft and having threadengaging surfaces including a projection at one side,y a pull-ofi' secured to said shaft and having opposed threadengaging surfaces, and `.cast-,olf arms having concaved surfaces enacting i' With the respective thread-engaging surfaces oi theftale-up and pull-off.` 10. .In a threadcontroller,means for guiding thethread, an oscillatoryfshaft, atakeugfcarried by, said shaitfcastsoii"I ineens for 4said takenp, ,a pull-oft' `carried by said shaft thereof, l,and means for yoscillating :said 40` take-up. ,4 u Y In testimonyWhereoi have signed my name to this s eciiication` .YEQRGE'S GATCHELL.

Certicate of Correction.

It is hereby certified that in Letters Patent No. 1,432,683, granted October 17, 1922, upon the application of George S. Gatschell, of Roselle Park, New Jersey, for an improvement in Thread Controllers, errors appear in the printed specifioation requiring correction as follows: Page 2, line 12, strike ont the Word surfece, page 3, line 118, claim 6, before the Word convex insert the Word opposed, and line 119, strike ont the Word opposed, and that the said Letters` Patent should be read with these corrections therein that the same may conform to the record of the ease in the Patent Ofiee.

Signed and sealed this 28th day of November, A. D., 1922.

[SEAL] KARL FENNING,

Actif/Lg Commissioner of Patents. 

